Question

Coherent light with wavelength 607 mn passes through two very
narrow slits, and the interference pattern is observed on a screen
a distance of 3.00 m from the slits. The first-order bright fringe
is a distance of 4.84 m from the center of the central bright
fringe.

For what wavelength of light will the first-order dark fringe (the
first dark fringe next to a central maximum) be observed at this
same point on the screen?
Express your answer in micrometers (not in nanometers).